| Abstract: |
The main interest of this work is concerned with the first EgyptianTokamak ”Egyptor”. Egyptor is a small size Tokamak but it is the big machinein our laboratory scale. Egyptor has noncircular cross section, ( R =30 cm, a =10 cm ) intended primarily to study plasma - wall interaction processes,influence of wall conditioning, fluctuation measurements, spectroscopy, and transport theory.The main goals are to develop the control system of Egyptor Tokamakand to carry out the discharge of all its capacitor banks. Hence, achievingcomplete operation of Egyptor Tokamak with its generated plasma. Moreovere,plasma simulation and the control of its parameters through the selection ofvalues for bank charge from the developed control system is presented.The device consists of a control system, vacuum chamber (Torus), ohmicheating system, toroidal field system, vertical field system. The basic facility includes a 250 kJ toroidal field bank, 90 kJ ohmic heating bank and 9 kJ vertical field bank. Oscillator with low energy cleaning discharges (RF) may be usedfor several hours to prepare the vessel walls for Tokamak regime of dischargesand to preionize the gas. Simple and efficient diagnostic techniques are used to measure the different parameters concerning the different discharge systems such as the Rogowesky coil, voltage loop, and the pickup coil.The discharge current of the ohmic heating bank, 28 kJ., is obtained forcharging voltage of 1.7 kV. The rise time of the discharge was 9.375 ms, thisshowed that the inductance of its circuit is 1.85 ml-I. The resistance of the circuit is obtained from the fitting of the current equation with the trace. This showedthat 1 = 37.5 ms. L= 1.85 mH, R=59 mO. Similarly toroidal field systemshowed that r = 66.7 ms. L= 1.28 mH, R=490 mO. The vertical field bankdischarge, 9.6 kJ., through the vertical coils showed that its period t = 80 ms.L= l.13 mH, R=400 mO. The discharge current of the toroidal field bank, 162kJ., has been carried out. The discharge current of the prionization bank, 7.5 kJ is obtained through the ohmic coil, which creates the plasma before the main ohmic bank.The vertical field bank is divided into two sections. The first section is thecompensated ohmic field with 14 turns connected to the ohmicdischarge circuit.The second section consists of 16 turns where the discharge current of thevertical field flows. Also, the discharge current of the preionization bank is applied to ohmic heating coil.Setting of PC card HlW and S/W, real time S/W, and calibration of I/O .channels of the acquisition card are achieved. Conventional buffer and tri-stae
|
|
|